DOI: 10.1175/JCLI-D-13-00271.1
Scopus记录号: 2-s2.0-84892467999
论文题名: The importance of representing mixed-phase clouds for simulating distinctive atmospheric states in the Arctic
作者: Engström A. ; Karlsson J. ; Svensson G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 1 起始页码: 265
结束页码: 272
语种: 英语
Scopus关键词: Bimodal distribution
; Frequency distributions
; Liquid water content
; Long-wave radiation
; Model and observation
; Supercooled liquids
; Surface heat budget of the arctic ocean
; Surface temperatures
; Atmospheric temperature
; Glacial geology
; Ice
; Liquids
; Climate models
; climate modeling
; cloud cover
; cloud water
; computer simulation
; heat budget
; ice thickness
; longwave radiation
; parameterization
; surface temperature
; water content
; Arctic Ocean
英文摘要: Observations from the Surface Heat Budget of the Arctic Ocean experiment (SHEBA) suggest that the Arctic Basin is characterized by two distinctly different preferred atmospheric states during wintertime. These states appear as two peaks in the frequency distribution of surface downwelling longwave radiation (LWD), representing radiatively clear and opaque conditions. Here, the authors have investigated the occurrence and representation of these states in the widely used ECMWF Interim Re-Analysis (ERA-Interim) dataset. An interannually recurring bimodal distribution of LWDvalues is not a clearly observable feature in the reanalysis data. However, large differences in the simulated liquid water content of clouds in ERA-Interim compared to observations are identified and these are linked to the lack of a radiatively opaque peak in the reanalysis. Using a single-column model, dynamically controlled by data fromERA-Interim, the authors show that, by tuning the glaciation speed of supercooled liquid clouds, it is possible to reach a very good agreement between the model and observations from the SHEBA campaign in terms of LWD. The results suggest that the presence of two preferred Arctic states, as observed during SHEBA, is a recurring feature of the Arctic climate system during winter [December-March (DJFM)]. The mean increase in LWD during the Arctic winter compared to ERAInterim is 15Wm-2. This has a substantial bearing on climate model evaluation in the Arctic as it indicates the importance of representing Arctic states in climate models and reanalysis data and that doing so could have a significant impact on winter ice thickness and surface temperatures in the Arctic. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51106
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology, Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Swedish e-Science Research Centre, Stockholm, Sweden
Recommended Citation:
Engström A.,Karlsson J.,Svensson G.. The importance of representing mixed-phase clouds for simulating distinctive atmospheric states in the Arctic[J]. Journal of Climate,2014-01-01,27(1)